Alert archive / Pennsylvania / Mesoscale Discussions in 2017

Mesoscale Discussion 1042

June 15, 201714 counties in Pennsylvania; Harrison County, Marion County, Monongalia County, West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jun 15, 2017, 4:01 PM EDT for 14 counties in Pennsylvania; Harrison County, Marion County, Monongalia County, West Virginia. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Jun 15, 2017, 4:01 PM EDT (20:01 UTC)
Expired
Jun 15, 2017, 6:00 PM EDT
In force
119 min
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Allegheny County, PA, Armstrong County, PA, Butler County, PA, Clarion County, PA, Elk County, PA, Fayette County, PA, Forest County, PA, Greene County, PA, Indiana County, PA, Jefferson County, PA, Venango County, PA, Warren County, PA, Washington County, PA, Westmoreland County, PA, Harrison County, WV, Marion County, WV, Monongalia County, WV

The radar

The Pittsburgh radar (KPBZ), 61 km from the middle of the area, began a volume at 20:04 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Pittsburgh, PA (KAGC), launched 12:00Z, 8.0 hours before the alert went out and 54 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2017-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 290 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 2017-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
290 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
892 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
39 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Pennsylvania, 2017Mesoscale Discussions in West Virginia, 2017Every mesoscale discussion in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.